Fixação de CO2 em efluente salino de indústria petroquímica

Abstract

FIXATION OF CO 2 IN BRINES OF PETROCHEMICAL INDUSTRY. In various industrial processes, such as the process of obtaining potassium by solution mining or in the oil industry, fuels are burnt concurrently to the formation of saline effluents. The opportunity to sequester carbon through capturing the CO 2 from the flue gas by carbonation of these effluents and reducing the potential of scaling of the water is evident. The use of saline industrial effluent from electrodialysis for carbon sequestration by mineralization of carbon dioxide is the focus of this work. The carbonation reaction of saline effluent of reverse electrodialysis, of low ionic strength and higher CO 2 solubility, was simulated through OLI ®. Precipitation tests were performed by bubbling 10-20 NL h-1 CO 2 in a glass reactor containing the brine and pH adjusted to 8.9. The solid was characterized and the results from the simulation and the experiments were compared. The removal of calcium and strontium in the form of carbonates reach out up to 98% and 75%. The simulation results were in line with the experimental results for the calcium behavior, but not for strontium. The OLI ® simulation was powerful to represent the calcium carbonate formation, however, comparisons between predicted Sr removal and testwork results presented differences and must be investigated.